Question

1. jack up the vehicle using a jack

put the jack under the correct lifting point of the vehicle, this information can be found in the vehicle owner’s or manufacturer service manual. avoid the weak parts of the vehicle body, such as the floor pan, radiator support and suspension members; as the jack or jack stands can penetrate or damage these parts!

1. use jack stands to support the load

place the jack stand under the correct lifting/supporting points of the vehicle (consult the vehicle’s owners or shop manual), slowly lower the jack until the jack stand fully supports the weight.
repeat step 5 and 6 for the other jack stands

1. check the stability of the vehicle

check the stability of the vehicle by gently rocking vehicle, the vehicle should have no significant movement; otherwise the vehicle is not securely supported by the jack stands.

1. remove the jack stands

when you’re finished with your work, jack up the vehicle using a jack, remove the jack stands and gently lower the jack until the vehicle rests on the ground.
why is it important to gently rock the vehicle after you’ve supported the vehicle with stands?
if one leg of a jack stand is not fully in contact with the shop floor, rocking the vehicle back and forth will cause the stand to settle out and make better contact.
this is necessary to ensure the vehicle security alarm does not sound when working under the vehicle.
to ensure the weight of the vehicle is properly supported before you perform work from under the vehicle.

Explanation:

Gently rocking the vehicle after supporting it with stands helps to check if the weight is properly supported. This is crucial for safety when working under the vehicle. A non - properly supported vehicle can be dangerous. The first option about the stand settling is not the main reason, and the second option about the security alarm is not relevant.

Answer:

To ensure the weight of the vehicle is properly supported before you perform work from under the vehicle.